Structural and Magnetic Properties of Sputter-Deposited Mn–Fe–Ga Thin Films

Niesen, Alessia; Sterwerf, Christian; Glas, Manuel; Schmalhorst, Jan-Michael; Reiss, Günter

doi:10.1109/tmag.2016.2528287

Cited by 11 publications

(11 citation statements)

References 16 publications

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“…In addition, the magnetic properties have been shown to be tunable by atomic substitution [13]. Other examples of Mn-based tetragonal Heusler compounds with high PMA are Mn 3 Ge [14], Mn 3−x Co x Ga [15,16], and Mn 2 Fe x Ga [17,18]. A particular case to note is Mn 2 Ru x Ga, which has a moderate anisotropy energy (K eff ∼ 40 kJ m −3 ), but an extremely low magnetization leading to a very high anisotropy field and predicted resonance frequency [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

et al. 2017

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Ferrimagnetic Mn 2 Fe x Ga (0.26 x 1.12) thin films have been characterized by x-ray diffraction, magnetometry, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and Mössbauer spectroscopy with the aim of determining the structure and site-specific magnetism of this tetragonal, D0 22 -structure Heusler compound. High-quality epitaxial films with low root-mean-square surface roughness (∼0.6 nm) are grown by magnetron cosputtering. The tetragonal distortion induces strong perpendicular magnetic anisotropy along the c axis with a typical coercive field μ 0 H ∼ 0.8 T and an anisotropy field ranging from 6 to 8 T. On increasing the Fe content x, substantial uniaxial anisotropy, K u 1.0 MJ m −3 , can be maintained over the full x range, while the magnetization of the compound is reduced from 400 to 280 kA m −1 . The total magnetization is almost entirelygiven by the sum of the spin moments originating from the ferrimagnetic Mn and Fe sublattices, with the latter being coupled ferromagnetically to one of the former. The orbital magnetic moments are practically quenched and have negligible contributions to the magnetization. The films with x = 0.73 exhibit an anomalous Hall angle of 2.5% and a Fermi-level spin polarization above 51%, as measured by point contact Andreev reflection. The Fe-substituted Mn 2 Ga films are tunable with a unique combination of high anisotropy, low magnetization, appreciable spin polarization, and low surface roughness, making them strong candidates for thermally stable spin-transfer-torque switching nanomagnets with lateral dimensions down to 10 nm.

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Section: Introductionmentioning

confidence: 99%

“…This was attributed to the presence of two magnetic phases, possibly due to Mn-Fe atomic disorder. Recently, Niesen et al [18] deposited Mn-Fe-Ga thin films with various compositions in both cubic and tetragonal phases. They found maximal coercivity (1.8 T) for a Mn 3 Fe 0.4 Ga composition.…”

Section: Introductionmentioning

confidence: 99%

Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

et al. 2017

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“…Considering that sputtering power can be calculated by formula (9), it can be expressed by formula (10).…”

Section: Methodsmentioning

confidence: 99%

“…Preparing thin films is crucial to developing microdevices. The thin-film physical, mechanical, and chemical properties depend on how the film structure is organized, which is closely related to film composition [8,9]. Single-metal-target and single-alloy-target sputtering are often used to fabricate various alloy thin films [10,11].…”

Section: Introductionmentioning

confidence: 99%

Composition Regulation and Microstructure Characterization of Fe_100-xGa_x Films in the Manufacturing Industry

et al. 2021

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Fe100-xGax giant magnetostrictive films (GMF) are attracting ever increasing attention for their potential application to manufacturing integrated magnetostrictive displacement sensors. However, it is difficult to fabricate Fe100-xGax thin films with different compositions at will. The influence of compositions on alloy phases, grain sizes, film surface roughness, and magnetic domains of the films and magnetization of magnetron sputtered Fe100-xGax films was investigated. Changing the ratio of the pure iron slice areas to alloy target areas, the desired film composition was achieved by the improved Mosaic method. The morphologies, magnetic domain structure, microstructure, and compositions of Fe100-xGax films revealed by SEM, EDS, XRD, MFM, VSM, and TEM. The results show that there are <1 1 0 > texture in magnetron sputtered Fe100-xGax films. The sharp peak attributed to the A2 microstructure suggests that the film is crystalline. The magnetic domain structure of Fe100-xGax films presents a network form, and the domain width decreases with the decrease of gallium content. It is also found that the magnetic domains of the films are not uniform. The TEM result shows that there are some strip patterns in the films, and the diffraction ring is discontinuous because of the structure extinction. For a suitable candidate of microdevice applications in MEMS, the optimum composition film should be Fe83.25Ga16.75 film.

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“…The so-called constructive chemical disorder, i.e., replacing Mn in Mn 3 Ga by 3d elements has been theoretically predicted to improve the spin polarization along the tetragonal c axis [38]. Thin films of Mn-Fe-Ga were recently reported to show high magnetocrystalline anisotropy; however, these films display high roughness [39]. Thin films of Mn 2 Fe x Ga grown on MgO substrates display a slight decrease of saturation magnetization M s with Fe concentration x, however, with nonfixed Ga concentration [40].…”

Section: Introductionmentioning

confidence: 99%

Tunable magnetic properties in tetragonal Mn-Fe-Ga Heusler films with perpendicular anisotropy for spintronics applications

Kalache

Selle

Schnelle

et al. 2018

Phys. Rev. Materials

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High perpendicular magnetic anisotropy is essential for the development of high-efficiency spintronics devices. In this paper, we investigate the structural and magnetic properties of Mn-Fe-Ga Heusler thin films with perpendicular magnetic anisotropy inherent to the tetragonal D0 22 structure. High quality films were heteroepitaxially grown on SrTiO 3 substrates by magnetron sputtering technique. The magnetic properties such as saturation magnetization and coercive field are easily tunable by the variation of the Mn/Fe ratio, while retaining out-of-plane magnetization over large composition range. The uniaxial anisotropy was improved in Mn 2.6−x Fe x Ga 1.4 through Fe substitution at a fixed Ga excess. Films with composition Mn 1.6 Fe 1 Ga 1.4 were found to be stable down to a thickness of 10 nm. Transmission electron microscopy investigations proved the high quality of the films as well as chemical homogeneity. The Hall effect exhibits an anomalous contribution that dominates over the normal part, leading to Hall angle as high as 3.4%. These findings suggest great potential for the integration of tetragonal Heusler materials into spintronic devices.

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Structural and Magnetic Properties of Sputter-Deposited Mn–Fe–Ga Thin Films

Cited by 11 publications

References 16 publications

Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

Composition Regulation and Microstructure Characterization of Fe_100-xGa_x Films in the Manufacturing Industry

Tunable magnetic properties in tetragonal Mn-Fe-Ga Heusler films with perpendicular anisotropy for spintronics applications

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Structural and Magnetic Properties of Sputter-Deposited Mn–Fe–Ga Thin Films

Cited by 11 publications

References 16 publications

Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

Structure, site-specific magnetism, and magnetotransport properties of epitaxial D022 -structure Mn2FexGa thin

Composition Regulation and Microstructure Characterization of Fe100-xGax Films in the Manufacturing Industry

Tunable magnetic properties in tetragonal Mn-Fe-Ga Heusler films with perpendicular anisotropy for spintronics applications

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Composition Regulation and Microstructure Characterization of Fe_100-xGa_x Films in the Manufacturing Industry